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Not a storage space!

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    Not a storage space!

    I was called to a ice arena for a disconnect problem. This is what I found. A 600 amp 600v rated switch, with 600 amp fuses had experienced an arc flash. The source is unknown, but I can tell you I megged everything and found no problems. This switch runs refrigeration compressors mounted on a skid. The skid has overcurrent protection via fused disconnect, with 300 amp fuses. All 600A fuses were open and no other fuses were failed. Looks like there was an arc drawn to the cover or chassis of the 600 amp switch. The switch has been sent to Square "D" for analysis. A new switch was installed and no further issues were found. The burnt up stuff in front of the panel was a box with pvc plumbing fittings. Good thing it wasn't a larger box.
    http://forums.mikeholt.com/attachmen...1&d=1235236196

    #2
    Good Pics.

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      #3
      KABOOM! nice pictures.
      [COLOR="blue"]"Electricity is really just organized lightning." George Carlin


      Derek[/COLOR]

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        #4
        Welcome to the Forum, nice first post.

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          #5
          Must have made some purdy fireworks! Nice first post, and welcome to the zoo..... er, I mean, forum.

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            #6
            What? You mean they're not supposed to be black and crispy like that?
            Two things are infinite : the universe and human stupidity; Iím not sure about the universe.

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              #7
              Boy, if someone was walking from right to left, carrying a box of PVC fittings, accidentally hooked the switch handle that is in the "ON" position while lots of amps were flowing, would that explain it?

              (Look for the white-as-a-ghost employee who went home sick that day...)

              kent

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                #8
                The source is unknown
                I'll bet you didn't get the whole story.
                Tim
                Master Electrician
                New England
                Yesterday's Technology at Tomorrow's Prices

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                  #9
                  some guy was probably messing around with it look in near by trash buckets with burned screwdrivers or something in it
                  "Most good electricians are pretty sure that they are the best and the great ones never stop trying to be."

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                    #10
                    The load was about 50 amps, there was only 1 compressor running. The only person in the building at the time was the clerk in the office.The power went out and came back on in the building. She then went to restart the refrigeration equipment and discovered the problem. The power went out all over town,( small town, pop.2000) and then came back on in less than a minute. The power co. verified the outage. The main was not tripped in this building and no other problems were found.

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                      #11
                      Could you explain what the second photo shows?? How did that material get out of the switch and onto the floor??? The enclosure is supposed to contain the explosion or burnt materials. I agree, someone didn't fully explain what caused this problem ?? The cover of the disconnect must have been open when the fault accurred!

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                        #12
                        I'm assuming no, but was there any GFPE on the main gear? What was the service size feeding the gear where the 600A switch got toasted?
                        Work Safer = Live Longer

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